OpenCv：绘制一个白色填充的多边形

发布于 2025-01-01 01:36:01 字数 936 浏览 0 评论 0原文

我想在黑色 IplImage 中绘制一个具有任意角度的白色填充多边形。我知道存在诸如 createCircle 之类的函数，但我找不到类似的多边形函数。我发现这个，但它的使用很糟糕，我的意思是，我不必只是为了在黑色背景上绘制一个简单的白色多边形而陷入困境......！

我在 OpenCV 文档中找到的示例：

void MyPolygon( Mat img )
{
   int lineType = 8;

   /** Create some points */
   Point rook_points[1][20];
   rook_points[0][0] = Point( w/4.0, 7*w/8.0 );
   rook_points[0][1] = Point( 3*w/4.0, 7*w/8.0 );
   rook_points[0][2] = Point( 3*w/4.0, 13*w/16.0 );
   rook_poi /*** blablabla **/
   rook_points[0][19] = Point( w/4.0, 13*w/16.0) ;

   const Point* ppt[1] = { rook_points[0] };
   int npt[] = { 20 };

   fillPoly( img,
             ppt,
             npt,
             1,
             Scalar( 255, 255, 255 ),
             lineType );
 }

基本上，我的问题是，如何将 CvBox2D 放入 fillPoly 中，以从中获取蒙版并最终设置我需要的“带角度的 ROI”？

原文

I'd like to draw a white filled polygon, with arbitrary angle, in a black IplImage. I know there exists function such as createCircle, but I can't find something similar for polygons.
I found this , but the use of it is awful, I mean I shouldn't have to go into this just to draw one simple white polygon on a black background...!

The example I found on the OpenCV documentation:

void MyPolygon( Mat img )
{
   int lineType = 8;

   /** Create some points */
   Point rook_points[1][20];
   rook_points[0][0] = Point( w/4.0, 7*w/8.0 );
   rook_points[0][1] = Point( 3*w/4.0, 7*w/8.0 );
   rook_points[0][2] = Point( 3*w/4.0, 13*w/16.0 );
   rook_poi /*** blablabla **/
   rook_points[0][19] = Point( w/4.0, 13*w/16.0) ;

   const Point* ppt[1] = { rook_points[0] };
   int npt[] = { 20 };

   fillPoly( img,
             ppt,
             npt,
             1,
             Scalar( 255, 255, 255 ),
             lineType );
 }

Basically, my question is, how do I put a CvBox2D into fillPoly, to get a mask out of it and finally set the "ROI with angle" that I need?

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Saygoodbye 2025-01-08 01:36:01

像这样：

#include <cv.h>

void drawBox( CvArr* img, CvBox2D box, CvScalar color )
{

    CvPoint2D32f pointsf[4];
    cvBoxPoints( box , pointsf );

    CvPoint pointsi[4];

    for(int i=0;i<4;i++)
    {
        pointsi[i]=cvPointFrom32f(pointsf[i]);
    }

    CvPoint* countours[1]={
        pointsi,
    };

    int countours_n[1]={
        4,      
    };

    cvFillPoly( img, countours, countours_n, 1, color );

}

Like this:

#include <cv.h>

void drawBox( CvArr* img, CvBox2D box, CvScalar color )
{

    CvPoint2D32f pointsf[4];
    cvBoxPoints( box , pointsf );

    CvPoint pointsi[4];

    for(int i=0;i<4;i++)
    {
        pointsi[i]=cvPointFrom32f(pointsf[i]);
    }

    CvPoint* countours[1]={
        pointsi,
    };

    int countours_n[1]={
        4,      
    };

    cvFillPoly( img, countours, countours_n, 1, color );

}

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